Refrigeration & Air Conditioning Mechanic Red Seal · Question
A technician is troubleshooting a system with low suction pressure, high superheat, and a frosted expansion valve body, but a warm liquid line entering it. What is the most likely cause?
These symptoms (low suction, high superheat, frosted TXV but warm liquid line) strongly indicate a restriction upstream of the TXV, such as a clogged filter dry
Start free practice for Refrigeration & Air Conditioning Mechanic Red Seal
500 questions · no signup required · 40 free questions per day
Question: A technician is troubleshooting a system with low suction pressure, high superheat, and a frosted expansion valve body, but a warm liquid line entering it. What is the most likely cause?
Answer options:
- Overcharge of refrigerant
- Low condenser airflow ✅ Partially restricted filter dryer or liquid line
- Compressor internal failure
Correct answer: Partially restricted filter dryer or liquid line
Explanation: These symptoms (low suction, high superheat, frosted TXV but warm liquid line) strongly indicate a restriction upstream of the TXV, such as a clogged filter dryer or a crimped liquid line. This causes a premature pressure drop and flash gas before the valve.
Start free practice for Refrigeration & Air Conditioning Mechanic Red Seal
500 questions · no signup required · 40 free questions per day
More about Refrigeration & Air Conditioning Mechanic Red Seal
Related Questions
- Which of the following refrigerants is a hydrofluorocarbon (HFC) and has a high ozone depletion potential (ODP
- Which component is responsible for compressing the refrigerant vapour to a high pressure and temperature?
- According to the Canadian Electrical Code (CEC), what is the minimum required working clearance in front of el
- What is the main operating characteristic difference between a fixed orifice (capillary tube) and a Thermostat
- Which type of electric motor requires a capacitor for starting and running, offering higher efficiency and bet
- When evacuating a refrigeration system, what is the recommended deep vacuum level, typically measured in micro
More for Refrigeration & Air Conditioning Mechanic Red Seal candidates
FAQs
Question explanations
- Which of the following refrigerants is a hydrofluorocarbon (HFC) and has a high ozone depletion potential (ODP
- Which component is responsible for compressing the refrigerant vapour to a high pressure and temperature?
- According to the Canadian Electrical Code (CEC), what is the minimum required working clearance in front of el
- What is the main operating characteristic difference between a fixed orifice (capillary tube) and a Thermostat
Ready to practice?
Free, no signup required. Build a wrong-question list as you go.
Start Free Refrigeration & Air Conditioning Mechanic Red Seal Practice →Related courses
Other Canadian certifications candidates often prepare for alongside this one.